Documentation ABI entry for overlays sysfs entries. Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> --- .../ABI/testing/sysfs-firmware-devicetree-overlays | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays new file mode 100644 index 0000000..adc4068 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays @@ -0,0 +1,40 @@ +What: /sys/firmware/devicetree/overlays/ +Date: October 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> +Description: + This directory contains the applied device tree overlays of + the running system, as directories of the overlay id. + + enable: The master enable switch, by default is 1, and when + set to 0 it cannot be re-enabled for security reasons. + + The discussion about this switch takes place in: + http://comments.gmane.org/gmane.linux.drivers.devicetree/101871 + + Kees Cook: + "Coming from the perspective of drawing a bright line between + kernel and the root user (which tends to start with disabling + kernel module loading), I would say that there at least needs + to be a high-level one-way "off" switch for the interface so + that systems that have this interface can choose to turn it off + during initial boot, etc." + +What: /sys/firmware/devicetree/overlays/<id> +Date: October 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> +Description: + Each directory represents an applied overlay, containing + the following attribute files. + + can_remove: The attribute set to 1 means that the overlay can + be removed, while 0 means that the overlay is being + overlapped therefore removal is prohibited. + +What: /sys/firmware/devicetree/overlays/<id>/<fragment-name>/ +Date: October 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> +Description: + Each of these directories contain information about of the + particular overlay fragment. + + target: The full-path of the target of the fragment -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
